Avast and Kaspersky

My PC is so slow these days that am thinking of scanning it with Kaspersky but l do not know if it is compatible with Avast. can someone tell me thanks.

No. It’s not compatible. You can use the on-line version of Kaspersky that is compatible with any other antivirus.
Kaspersky (very good detection rates)

Also, there are others:
ESET NOD32
Trendmicro housecall
AVGas (does not necessary if you have AVG antispyware installed)
F-Secure
BitDefender (free removal of the malware)
HitmanPro (multiply scanners)

Did you try to scan your computer with antispywares (like AVGas, a-squared, SpywareTerminator, SUPERAntispyware…)?

HI Tech, Yes l did scan my PC with AVG and the result was very good but my PC has gotten so slow of late l do not know if it is a virus or all the upgrading that has eaten up the resources thereby making it so slow.

I deleted some memory files that were affected by Trojan could this be the cause

If you still detecting strange behaviors or you want to be sure you’re clean, maybe making a HijackThis log to post here and, specially, scan and submit to on-line analysis the RunScanner log would help to identify the problem and the solution.

Thanks Tech, l will try one or two solution you suggested.