Some solutions only worked for some people - NO GUARANTEES it will work for you

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Low fps, black screen, other graphical problems possible solutions:

1) In game, go to Settings -> Video, and set 'Overall Quality' to 'low'.

2) NVidia GPU users: you can try drivers version 340.52, 353.62, 355.30, 355.60, 358, 361.43, 368.39, 373.06

3) Find this file:

Documents/BFBC2/settings.ini -> (open with wordpad or notepad)

Look for this line:
DxVersion=auto

-> change 'auto' to 9, then save file.

4) Try running windows update, and downloading the Security update for Microsoft Visual C++ Redistributable 2005.

5) You can also try editing some lines in the settings.ini file to change values to low/false/'0' for what works on your PC: as an example, change the 'RenderAheadLimit' value from '2' to '0'
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Crashes, freezes

Some hardware monitoring programs running in the background may cause crashes, freezes. Some examples which may cause problems on some systems:
CPU-z
MSI Afterburner
EVGA Pricision X
ASUS AI Suite+
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Lag & ping community derived possible solutions:

- run game as administrator & Windows 7 compatibility mode
- re-enter the fullscreen of the game multiple times using keyboard shortcut: LEFT ALT + ENTER
- ALT-TAB multiple times
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Punkbuster problems

You may not be having the same problem as me, but when I got this problem:
RESTRICTION: Service Communication Failure: PnkBstrB.exe initialization failed.

-> or any punkbuster problem, the below solution works for me (don't know if it will for you)
Download this:
http://www.evenbalance.com/downloads/pbsvc/pbsvc.exe

Restart the PC, and run pbsvc.exe

(also for me, I discovered that certain versions Razer Cortex (may include other programs/antivirus as well?) crashes punkbuster
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Serial code/login or 'key already in use' problems:

http://steamproxy.net/sharedfiles/filedetails/?id=592224438
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Can't enter servers/lost connection problem:

1) Logout, then re-login again.

If not, try the steps under Punkbuster problems as above

If still unsuccessful, try the steps in this link:
http://steamproxy.net/app/24960/discussions/0/364041517006350607/
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Game reinstalls everytime started

Steam > steamapps > common > (folder of game having the issue) > _CommonRedist > vcredist > 2012 (or similar) > and then deleting the installscript.vdf located there.

or

go to C:\Program Files (x86)\Steam\steamapps\common/(game having the issue) then removing the common redist folder in there